JP6172111B2 - Lower body structure of the vehicle - Google Patents

Description

  The present invention relates to a lower body structure of a vehicle, and more particularly to a lower body structure of a vehicle including a spare tire pan formed so as to be recessed downward into a floor panel behind a rear cross member.

  2. Description of the Related Art Conventionally, a spare tire storage structure in which a spare tire pan having a depth corresponding to the width of a spare tire is recessed in a floor panel and the spare tire is stored in a substantially horizontal shape in the spare tire pan is known.

  In a multipurpose passenger car for sports, which is a bottom floor floor, so-called SUV (Sport Utility Vehicle), the seats on which passengers sit are arranged in two or more rows (for example, three rows) in front and back, so that a plurality of seats are supported. A structure in which a plurality of cross members are provided in the front-rear direction and a part of the last row of seats is disposed above the spare tire pan is also known.

  The lower body structure of the vehicle of Patent Document 1 includes a pair of left and right side sills extending in the front-rear direction, a floor panel installed on the pair of side sills, a front-rear direction on the inner side of the pair of side sills and the lower surface side of the floor panel. A pair of left and right front side frames and a pair of left and right rear side frames are provided, and a bending member that bends to the side sill is provided at the front end of the rear side frame, and the rear end of the front side frame is provided at the front end of the bending member. Are joined.

The lower vehicle body structure of the vehicle of Patent Document 1 includes first to third cross members laid on a pair of front side frames, fourth to sixth cross members laid on a pair of rear side frames, A pair of left and right vertical members that connect the fourth cross member and a fifth cross member provided near the top of the kick-up portion in the front-rear direction are formed.
This ensures the rigidity of the lower vehicle body.

JP 2005-67288 A

  By the way, in the case of a vehicle body having a long separation distance between the spare tire pan and the front cross member, the cross member may move forward by the front end portion of the spare tire at the time of a rear collision, and the spare tire may move upward in the front side. .

  An object of the present invention is to provide a lower vehicle body structure or the like of a vehicle that can suppress the upward movement of a spare tire while ensuring the collision energy absorption performance at the time of a rear collision.

The lower body structure of the vehicle according to claim 1 includes a pair of left and right side sills extending in the front-rear direction, a floor panel constructed on the pair of side sills, an inner side of the pair of side sills, and a lower surface side of the floor panel. A pair of left and right rear side frames extending in the front-rear direction, a front cross member and a rear cross member installed on the pair of rear side frames on the lower surface side of the floor panel, and a floor panel behind the rear cross member In the lower body structure of a vehicle provided with a spare tire pan formed so as to be recessed downward, a longitudinal member that connects the front cross member and the rear cross member in the front-rear direction, the spare tire provided bread longitudinal members arranged in the vehicle width direction position corresponding to the front end of the longitudinal member, the floor panel cooperating It is characterized by being configured a closed cross section extending in a longitudinal direction Te.
In this lower body structure of the vehicle, a spare tire is provided because a vertical member is provided at a position in the vehicle width direction corresponding to the front end portion of the spare tire pan and connects the front cross member and the rear cross member in the front-rear direction. It is possible to prevent the rear cross member from moving forward by the front end portion of the tire, and to prevent the spare tire from moving upward in the front side.

The lower body structure of the vehicle according to claim 2 includes a pair of left and right side sills extending in the front-rear direction, a floor panel laid on the pair of side sills, an inner side of the pair of side sills, and a lower surface side of the floor panel. A pair of left and right rear side frames extending in the front-rear direction, a front cross member and a rear cross member installed on the pair of rear side frames on the lower surface side of the floor panel, and a floor panel behind the rear cross member In the lower body structure of a vehicle provided with a spare tire pan formed so as to be recessed downward, a longitudinal member that connects the front cross member and the rear cross member in the front-rear direction, the spare tire A fuel is provided with a vertical member disposed at a position in the vehicle width direction corresponding to the front end of the pan, and a rear portion disposed below the vertical member. Comprising a tank, it is characterized in that the lower end wall of the longitudinal member is formed in a curved shape to shift upward as the front side.
In this lower body structure of the vehicle, it is possible to prevent the forward movement of the rear cross member by the front end portion of the spare tire, and to suppress the upward movement of the spare tire.
In addition, the buckling timing of the vertical member can be delayed by suppressing the stress concentration in the vertical member while securing the arrangement space of the fuel tank.

The lower body structure of the vehicle according to claim 3 includes a pair of left and right side sills extending in the front-rear direction, a floor panel erected on the pair of side sills, an inner side of the pair of side sills, and a lower surface side of the floor panel. A pair of left and right rear side frames extending in the front-rear direction, a front cross member and a rear cross member installed on the pair of rear side frames on the lower surface side of the floor panel, and a floor panel behind the rear cross member In the lower body structure of a vehicle provided with a spare tire pan formed so as to be recessed downward, a longitudinal member that connects the front cross member and the rear cross member in the front-rear direction, the spare tire A vertical member disposed at a position in the vehicle width direction corresponding to the front end of the pan is provided, and the vertical member and the spare tire pan Department has been characterized in that it is arranged on an extension line extending longitudinally through the vehicle widthwise center.
In this lower vehicle body structure of the vehicle, the forward movement of the rear cross member by the front end portion of the spare tire can be further prevented and the upward movement of the spare tire can be suppressed.

The invention according to claim 4 is the invention according to any one of claims 1 to 3 , wherein the lower end wall portion of the front cross member is disposed above the lower end wall portion of the rear cross member, and the vertical member It is characterized in that the lower end wall portion is formed so as to move upward toward the front side.
Thereby, the support rigidity of the rear side cross member by a vertical member can be improved, and the movement to the front side upper direction of a spare tire can be suppressed further.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the vertical member is connected to the front cross member so as to suppress the upward movement of the rear cross member at the time of a rear collision. It is characterized by having.
Thereby, the upward movement of the rear cross member can be suppressed, and the upward movement of the spare tire can be suppressed.

  According to the lower vehicle body structure of the vehicle of the present invention, the safety of the occupant can be ensured by suppressing the upward movement of the spare tire while ensuring the collision energy absorption performance at the time of a rear collision.

It is the figure which looked at the vehicle concerning Example 1 from the left rear. It is the figure which looked at the luggage compartment which abbreviate | omitted the sheet | seat and the trunk board from the upper left side. It is a top view. It is the IV-IV sectional view taken on the line of FIG. It is a bottom view. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a figure which shows a vertical member, Comprising: (a) is a bottom view, (b) is a side view, (c) is a perspective view. It is a figure which shows the deformation | transformation behavior around the spare tire pan at the time of a rear collision, Comprising: (a) is a collision middle state, (b) is a FIG. 6 equivalent view which shows a collision late state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The following description exemplifies a case where the present invention is applied to a vehicle, and does not limit the present invention, its application, or its use. In the figure, the direction of arrow F is assumed to be the front, and the direction of arrow L is assumed to be the left.

Embodiment 1 of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 to 5, the vehicle V includes a pair of left and right side sills 1, a floor panel 2, a pair of left and right rear side frames 3, a plurality of cross members 11 to 16, a vertical member 4, and the like. A sport utility vehicle equipped with sports.
The vehicle V includes a luggage compartment formed behind the third row seat 8 and a lift gate (not shown) capable of opening and closing the rear opening 5.

The pair of left and right side sills 1 are each constituted by a closed cross-section member and are formed to extend in the front-rear direction at both ends in the vehicle width direction.
The floor panel 2 is constructed on a pair of side sills 1 and constitutes the floor surface of each of the vehicle compartment and the cargo compartment. The floor panel 2 is formed with a kick-up portion K having an upward rearward inclination at a position corresponding to the front end side portion of the pair of left and right rear wheel houses 6.
On the floor panel 2, a first row seat (not shown) and a second row seat 7 are mounted on the front side of the kick-up portion K, and a third row seat 8 is mounted on the rear side of the kick-up portion K. ing. A fuel tank 9 is provided below the second row seat 7 with the floor panel 2 interposed therebetween. The floor panel 2 on the floor surface of the cargo compartment is formed with a spare tire pan 2a that is recessed downward in the center portion and accommodates a spare tire T. The center portion of the spare tire pan 2a is disposed on an extension line extending in the front-rear direction through the center in the vehicle width direction. Usually, the upper surface of the cargo floor is covered with the trunk board 10.

As shown in FIG. 5, the pair of left and right rear side frames 3 are formed so as to extend in the front-rear direction on the inner side of the pair of side sills 1 and on the lower surface side of the floor panel 2.
The rear side frame 3 is formed in a substantially hat shape in cross section, and forms a closed cross section extending in the front-rear direction in cooperation with the floor panel 2. The middle part of the rear side frame 3 is formed in an upwardly inclined manner so as to overhang corresponding to the kick-up part K.
A pair of left and right crash cans 22 to which a bumper rain 23 is attached are attached to the rear ends of the pair of rear side frames 3 via a rear end panel 21.

Next, the plurality of cross members 11 to 16 will be described.
No. The three cross members 11 are installed in the middle of the pair of side sills 1 on the lower surface side of the floor panel 2. This No. The three cross member 11 is formed in a substantially crank shape in cross section, and constitutes a closed cross section extending in the vehicle width direction in cooperation with the floor panel 2.
As shown in FIGS. 4 to 6, the intermediate cross member 12 (front cross member) 3 is disposed behind the cross member 11, and is installed on the front end side portion of the pair of rear side frames 3 on the lower surface side of the floor panel 2. The intermediate cross member 12 is formed in a substantially hat shape in cross section, and forms a closed cross section extending in the vehicle width direction in cooperation with the floor panel 2.
These No. The third cross member 11 and the intermediate cross member 12 support the front end portion and the rear end portion of the slide mechanism of the second row seat 7, respectively.

No. The four cross members 13 (rear cross members) are disposed behind the intermediate cross members 12 and are installed near the tops of the kick-up portions K of the pair of rear side frames 3 on the lower surface side of the floor panel 2. . This No. The four cross members 13 are formed in a substantially hat shape in cross section, and constitute a closed cross section extending in the vehicle width direction in cooperation with the floor panel 2.
No. The bottom wall 13a of the 4 cross member 13 is The three cross members 11 are disposed at a height higher than the lower end wall portion 11 a of the intermediate cross member 12 and lower than the lower end wall portion 12 a of the intermediate cross member 12.

  As shown in FIGS. On the upper side of the 4 cross member 13, an upper cross member 14 is disposed via the floor panel 2. The upper cross member 14 is formed in a substantially hat shape in cross section, and constitutes a closed cross section extending in the vehicle width direction in cooperation with the floor panel 2. No. The front and rear flange portions of the 4 cross member 13, the front and rear flange portions of the upper cross member 14, and the floor panel 2 are triple-joined by welding so that closed cross sections extending in the vehicle width direction are arranged side by side. These front flange portions are disposed at a lower height than the rear flange portion.

No. The 5 cross member 15 is 4 is arranged behind the cross member 13 and is installed in the middle of the pair of rear side frames 3 on the lower surface side of the floor panel 2 and the spare tire pan 2a. This No. The 5 cross member 15 is formed in a substantially hat shape in cross section, and constitutes a closed cross section extending in the vehicle width direction in cooperation with the floor panel 2 and the spare tire pan 2a.
The rear cross member 16 is formed in a closed cross-sectional structure that extends in the vehicle width direction in cooperation with a rear end member and a rear end panel 21 disposed on the rear side of the rear end member.
The rear cross member 16 constitutes a lower edge portion of the rear opening 5.

  As shown in FIGS. 2 to 4 and 6, in the upper part of the front end side of the spare tire pan 2 a, the middle part of the pair of rear side frames 3 corresponding to the rear end part of the pair of left and right rear wheel houses 6. A horizontal seat frame 17 is provided through a pair of left and right mounting portions 24 protruding upward. The central part in the vehicle width direction of the horizontal seat frame 17 is connected to the central part in the vehicle width direction of the upper cross member 14 by a vertical seat frame 18 that extends linearly in the front-rear direction. The horizontal seat frame 17 and the vertical seat frame 18 support the bench-type third row seat 8. Reference numeral 24 denotes a cover that covers the attachment portion in FIG. 2, and denotes an attachment portion formed of a sheet metal member in FIG. 3.

Next, the vertical member 4 will be described.
The vertical member 4 has No. No. caused by the pressing force by the front end portion of the spare tire T at the time of rear collision. The four cross members 13 are configured to suppress forward movement and upward movement.
4-6, the vertical member 4 is arrange | positioned on the extended line extended in the front-back direction between the floor panel 2 and the fuel tank 9, and passing through the center of a vehicle width direction, and intermediate cross member 12 and No. . Four cross members 13 are connected in the front-rear direction.

  As shown in FIGS. 7A to 7C, the vertical member 4 is formed in a substantially hat-like vertical cross section, and rises vertically upward from the lower end wall portion 4a and both left and right end portions of the lower end wall portion 4a. A pair of left and right side wall portions 4b, 4c, a pair of left and right flange portions 4d, 4e projecting outward from the upper end portions of the pair of side wall portions 4b, 4c in the vehicle width direction, and a front end portion of the lower end wall portion 4a A front flange portion 4f projecting forward from the rear end portion and a rear flange portion 4g projecting rearward from the rear end portion of the lower end wall portion 4a.

  The lower end wall portion 4a is formed in a curved shape that moves upward toward the front side along the upper surface of the rear portion of the fuel tank 9 and bulges upward. The pair of left and right flange portions 4d and 4e are each provided with a plurality of (for example, three) beads arranged in the front-rear direction and extending in the vehicle width direction, and are joined to the lower surface side of the floor panel 2. The front flange 4f is joined to the lower end wall 12a of the intermediate cross member 12, and the rear flange 4g is The 4 cross member 13 is joined to the lower end wall portion 13a. Thus, the vertical member 4 forms a closed cross section having a substantially rectangular cross section extending in the front-rear direction in cooperation with the floor panel 2.

Next, the deformation | transformation behavior of the spare tire T and each member at the time of a rear collision is demonstrated.
As shown in FIG. 6, in the normal state before the rear impact, the upper end portion of the spare tire T is accommodated in the spare tire pan 2 a with the upper end portion slightly protruding upward, and three rows above the front end portion of the spare tire T. An eye sheet 8 is provided.

In the initial stage of the collision, the collision load input through the bumper rain 23 is absorbed by the crash can 22 being crushed and deformed.
As shown in FIG. 8A, in the middle of the collision, a collision load that is not absorbed by the crushing deformation of the crash can 22 acts on the spare tire T and presses the spare tire T forward.
No. No. 4 cross member 13 is supported by the intermediate cross member 12 via the vertical member 4. A predetermined portion of the floor panel 2 between the 4 cross member 13 (upper cross member 14) and the front end portion of the spare tire pan 2a is compressed by the pressing force from the front end portion of the spare tire T and starts to deform.

As shown in FIG. 8B, in the late stage of the collision, the compression deformation of the predetermined portion of the floor panel 2 is completed, and the pressing force from the front end portion of the spare tire T is no. 4 Acts directly on the cross member 13. The vertical member 4 with a closed cross-section is No. 4 Since the cross member 13 is supported, no. 4 to prevent the cross member 13 from moving forward, and the intermediate cross member 12 and The compression deformation of the predetermined part of the floor panel 2 between the 4 cross members 13 is suppressed.
Further, due to the pressing force from the front end of the spare tire T, No. The 4 cross member 13 is subjected to a stress that rotates counterclockwise around the front flange portion in a side view, and the rear flange portion 4g is No. 4 cross member 13. 4 because it is joined to the lower end wall 13a of the cross member 13. The upward movement of the four cross member 13 is suppressed.

Next, functions and effects of the lower vehicle body structure of the vehicle V will be described.
According to the lower vehicle body structure of the vehicle V, the vehicle V is disposed at the vehicle width direction position corresponding to the front end portion of the spare tire pan 2a and No. 4 by the front end portion of the spare tire T is provided because the vertical member 4 that connects the cross member 13 in the front-rear direction is provided. The forward movement of the 4-cross member 13 can be prevented, and the upward movement of the spare tire T can be suppressed.
No. 4 is provided with a spare tire pan 2a formed so as to be recessed downward into the floor panel 2 behind the cross member 13, so that the spare tire pan 2a does not function as a crash stroke positively. Tire pan 2a and No. 2 The crash stroke can be ensured at a separation distance from the four cross member 13.

  The lower end wall portion 12a of the intermediate cross member 12 is No. 4 by the vertical member 4 because the lower end wall portion 4a of the vertical member 4 is formed so as to move upward toward the front side. The support rigidity of the four cross member 13 can be improved, and the movement of the spare tire T upward in the front side can be further suppressed.

  A fuel tank 9 having a rear portion disposed below the vertical member 4 is provided, and a lower end wall portion 4a of the vertical member 4 is formed in a curved shape that moves upward toward the front side, so that a space for disposing the fuel tank 9 is secured. The stress concentration in the vertical member 4 can be suppressed and the buckling timing of the vertical member 4 can be delayed.

  The vertical member 4 is No. 4 is connected to the intermediate cross member 12 so as to suppress the upward movement of the cross member 13. The upward movement of the 4 cross member 13 can be suppressed, and the upward movement of the spare tire T can be suppressed.

Next, a modified example in which the embodiment is partially changed will be described.
1) In the above-described embodiment, an example of a single vertical member arranged on an extension line extending in the front-rear direction through the center in the vehicle width direction has been described, but in the vehicle width direction corresponding to at least the front end portion of the spare tire pan It suffices if there are vertical members arranged at positions, and two or more vertical members may be installed.

2] In the above embodiment, No. Although an example in which a predetermined part of the floor panel between the four cross members and the front end of the spare tire pan is used as a crash stroke at the time of rear-end collision has been described, spare parts are used within a range that does not affect the seating state of the occupants of the last row seat. A part of the spare tire pan may be used for the crash stroke by moving the tire upward. As a result, no. The space between the 4 cross member and the front end of the spare tire pan can be shortened.

3] In the above-described embodiment, an example in which a part of the last row of seats is disposed above the spare tire pan has been described, but the last row of seats may be mounted on the front side of the front end of the spare tire pan. good. Further, the horizontal seat frame and the vertical seat frame can be omitted.

4) In the above embodiment, the example in which the upper end portion of the spare tire is slightly protruded has been described as being accommodated in the spare tire pan. However, a spare tire pan having a depth corresponding to the width of the spare tire is formed. The present invention can also be applied to a vehicle that can accommodate the entire spare tire in a spare tire pan.

5] In addition, those skilled in the art can implement the present invention with various modifications added without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

V Vehicle 1 Side sill 2 Floor panel 2a Spare tire pan 3 Rear side frame 4 Vertical member 4a Lower end wall 9 Fuel tank 12 Intermediate cross member (front cross member)
12a Lower end wall portion 13 4 cross member (rear cross member)
13a Lower end wall T Spare tire

Claims (5)

A pair of left and right side sills extending in the front-rear direction, a floor panel installed on the pair of side sills, a pair of left and right rear side frames extending in the front-rear direction inside the pair of side sills and on the lower surface side of the floor panel; A front cross member and a rear cross member installed on the pair of rear side frames on the lower surface side of the floor panel, and are formed so as to be recessed downward into the floor panel behind the rear cross member. In the lower body structure of a vehicle equipped with a spare tire pan,
A vertical member that connects the front cross member and the rear cross member in the front-rear direction, and provided with a vertical member disposed at a vehicle width direction position corresponding to the front end of the spare tire pan ,
A lower body structure of a vehicle, wherein the vertical member forms a closed cross section extending in the front-rear direction in cooperation with the floor panel . A pair of left and right side sills extending in the front-rear direction, a floor panel installed on the pair of side sills, a pair of left and right rear side frames extending in the front-rear direction inside the pair of side sills and on the lower surface side of the floor panel; A front cross member and a rear cross member installed on the pair of rear side frames on the lower surface side of the floor panel, and are formed so as to be recessed downward into the floor panel behind the rear cross member. In the lower body structure of a vehicle equipped with a spare tire pan,
A vertical member that connects the front cross member and the rear cross member in the front-rear direction, and provided with a vertical member disposed at a vehicle width direction position corresponding to the front end of the spare tire pan,
A fuel tank having a rear portion disposed below the vertical member;
Lower vehicle body structure of the vehicles you characterized in that the lower end wall portion is formed in a curved shape to shift upward as the front side of the longitudinal member. A pair of left and right side sills extending in the front-rear direction, a floor panel installed on the pair of side sills, a pair of left and right rear side frames extending in the front-rear direction inside the pair of side sills and on the lower surface side of the floor panel; A front cross member and a rear cross member installed on the pair of rear side frames on the lower surface side of the floor panel, and are formed so as to be recessed downward into the floor panel behind the rear cross member. In the lower body structure of a vehicle equipped with a spare tire pan,
A vertical member that connects the front cross member and the rear cross member in the front-rear direction, and provided with a vertical member disposed at a vehicle width direction position corresponding to the front end of the spare tire pan,
The longitudinal member and the central portion of the spare tire pan, the lower vehicle body structure of the vehicles characterized in that it is arranged on an extension line extending longitudinally through the vehicle widthwise center. The lower end wall portion of the front cross member is disposed above the lower end wall portion of the rear cross member,
The lower body structure of the vehicle according to any one of claims 1 to 3, wherein a lower end wall portion of the vertical member is formed so as to move upward toward the front side . The vehicle according to any one of claims 1 to 4, wherein the vertical member is connected to the front cross member so as to suppress an upward movement of the rear cross member in a rear collision. Lower body structure.